02004naa a2200265 a 450000100080000000500110000800800410001902400280006010000180008824502040010626000090031052011560031965000120147565000210148765000130150865000170152165000100153865000180154865000250156665000100159165000180160165300150161970000230163477300810165715209472023-05-03       1975    bl uuuu     u00u1 u    #d7 a10.1007/BF014600162DOI1 aLEVINE, N. D.  aMicrometeorological factors involved in development and survival of free-living stages of the sheep nematodes Haemonchus contortus and Trichostrongylus colubriformis. A review.h[electronic resource]  c1975  aTemperature and soil moisture are the most important factors affecting the development and survival of Haemonchus contortus and Trichostrongylus columbriformis eggs and larvae on pasture. More than half of the eggs develop into infective larvae in the laboratory, but a very low percentage (0.03% for H. contortus) does so on pasture. There is a marked difference between H. contortus and T. colubriformis in survival of infective larvae. H. contortus larvae survived in the winter at Urbana poorly, whereas T. colubriformis did well. The former survived better than the latter in the spring and worse in the summer, while both survived equally well in the fall. Technics for larval recovery from pasture are not very efficient. Meteorologic conditions at ground level where the larvae exist are quite different from those in a standard weather shelter 1.6 m above the ground. Bioclimatographs in which mean monthly maximum temperatures are plotted against total monthly precipitation are fairly good in predicting the type of nematode liable to be important in a given region, but they are too simplistic to be relied on for more than approximations.  aClimate  aClimatic factors  aNematoda  aParasitology  aSheep  aEpidemiologia  aHaemonchus Contortus  aOvino  aParasitologia  aNematodeos1 aTODD JUNIOR, K. S.  tInternational Journal of Biometeorologygv. 19, n. 3, p. 174-183, Nov. 1975.